76 BULLETIN 199, UNITED STATES NATIONAL MUSEUM 



Cachryx Cope, Proc. Acad. Nat. Sci. Philadelphia, 1866, p. 124 (genotype, Cteno- 

 saura erythromelas Boulenger). 



Genotype. — Cyclura quinguecarinata Gray. 



Range. — Michoacan to the Isthmus of Tehuantepec, the Peninsula 

 of Yucatan, and northern Guatemala. 



Species. — Five, all but one of which (C. palearis of Guatemala) 

 occur in Mexico. 



KEY TO MEXICAN SPECIES OF ENYALIOSAURUS 



1. Whorls of enlarged caudal scales not interspersed with small scales. 



defensor (p. 77) 

 Whorls of enlarged caudal scales interspersed with smaller scales 2 



2. Dorsal and lateral caudal scales of nearly uniform character in each whorl. 



erythromelas (p. 77) 



Dorsal and lateral caudal scales not of nearly uniform character but median 



longitudinal series and outer lateral series differentiated 3 



3. Median row of dorsal scales extending to or almost to sacrum, noticeably 



raised, of medium height; tail twice length of body.quinquecarinata (p. 76) 



Median row of dorsal scales extending only two-thirds distance to sacrum 



and not noticeably raised; tail about lyi times body length. .clarki (p. 76) 



ENYALIOSAURUS QUINQUECARINATUS (Gray) 



Cyclura quinquecarinata Gray, Zoological miscellany, 1842, p. 59. 

 Enyaliosaurus quinquecarinatus, Gray, Catalogue of the specimens of lizards in 



the collections of the British Museum, 1845, p. 192. 

 Cyclura (Ctenosaura) quinquecarinata, Cope, Proc. Amer. Philos. Soc, vol. 11, 



p. 161. 

 Ctenosaura quinquecarinata, Sumichrast, Bull. Soc. ZooL, vol. 10, 1880, p. 175. — 



Bailey, Proc. U. S. Nat. Mus., vol. 73, art. 12, 1928, pp. 42-44, pis. 24, 25, 26. 



Type. — Brit. Mus. Nat. Hist. No. 61; collector unknown. 



Type locality. — Unknown (restricted to Tehuantepec, Oaxaca, by- 

 Bailey, loc. cit.). 



Range. — Lowland regions of southern Oaxaca. Reported from 

 Oaxaca: Tehuantepec, "Hugma, Temiinos," San Pedro, and Mixte- 

 quilla Mountains, between Salina Cruz and Tequesixtlan. 



ENYALIOSAURUS CLARKI (Bailey) 



Enyaliosaurus quinquecarinatus, DuGfes, La Naturaleza, ser. 2, vol. 2, 1897, pp. 



523-524, pi. 34 (color). 

 Ctenosaura clarki Bailey, Proc. U. S. Nat. Mus., vol. 73, art. 12, 1928, pp. 44-46, 



pi. 27. 



Type. — Mus. Comp. Zool. No. 22454; Hans Gadow collector. 



Type locality. — Ovopeo, Michoacan, elevation 1,000 feet. 



Range. — Known definitely only from the type locality; a record for 

 Cuautla, Morelos, probably belongs here (Duges, La Naturaleza, ser. 

 2, vol. 2, 1896, p. 480). 



